Suburban Tennis time
It's nice to get away from downtown Tokyo, and see some of the beautiful suburban areas. Going for a day of tennis could be a good way to spend an afternoon in Tokyo suburbia. Taking a trip to Chofu, west of Tokyo on the Keio line from Shinjuku is a good and close option for tennis.
Keio sports club is located in Chofu and has reasonable prices for court rentals: just 2,625 yen for an hour on weekdays. You need to call to make a court reservation at this number: 042-482-2666
Here is the Japanese website: http://www.keio-tc.com/rental.html